Reinforced concrete floor and ceiling.



PATENTED MAY'ZG, 1908.

I G. M. GRAHAM. REINFORCED CONCRETE FLOOR AND GEILI APPLICATION FILED OUT 17, 1-907.

'- properties of great strength and lightness, is

i 1, 2 and 3, illustrate the pro ressive steps in light and strong structure, as set forth in destep of the resent system, as shown in Figs.

To allwhom it may concern:

center2, by a series of suspension links 5, of

UNITED sTAr s PATENT oiuucu.

GEORGE M. GRAHAM, ()l! CHICAGO, ILLINOIS, ASSIGNOR 'lU G. A. HDWKR D KOH LER, CF

ILLINQIS.

REINFQRCED CONCRETE FLOOR AND CEILING.

Specification ofLetters P atent.

Patented May 26, 1 908.-

Application flied October 17, 1907. Serial No. 397,850.

Be it known that I, GEORGE M. GRAHAM, a citizen of the United' States of America, and Y a resident of Chicago, in the county ofC-ook and State of Illinois, have invented certain new and useful Improvements in Reinforced Concrete Floors and Ceilings, of which the following is a specification.

This invention relates to a'method of form'- ing the floors, or other like substantially horizontal portions of the reinforced concrete structure which forms the subject'matter of my former patent No. 865,490 dated Sept. 10, 190.7 And the present improve ment has for its object to provide a simple, efficient and economical method whereby a reinforced concrete floor or the like, with the produced, al as will hereinafter more fully ap ear. s I

n the accompanying drawings :'F1gures the present method, beginning with the reinforcin skeleton structure and ending with, thefini ed floor section or unit.

Referring to the drawings, 1 represents the opposed members ofa border frame of round tubing, around which are wound continuous wrappings of wire to form the up er and lower skeleton centers .2v and 3 there 'or, and in conjunction with said border frame constitute the skeleton reinforcing portion of a reinforced concrete floor or other like part of a building; and in which construction thein- (l'ividual wire strands comprising the said upper and lower wire skeleton centers 2 and 3 are adapted" to assume a common and uniform tensionand bear in an even and uniform manner the normal load imposed upon the frame as a whole, and so afford a very tail in my aforesaid of Sept. 10, 1907,

4 is a perforated lathing sheet supported a distance away from the upper skeleton wire prior patent No. 865,490,

varying lengthaand so that the perforated lathing will lave a dished form in the initial 1 and 2 of t e drawing and as fully set forth in my aforesaid patent.

6 1s a temporary nold plate or board sccured to the underside of the lower skeleton 1 time remove "wire center 3, by suspension loops or other like means adapted to support said plate or board in p'aral 3 aforesaid.

l relation and a short distance beneath the lower skeleton wire center In the present method, the respective upper and lower skeleton Wire centers 2 and 3 will initially have the fiat and undished form illustrated in Fig. 1. Fine concrete material is' dro ped from above, and descending through the mesh of the upper center 2 and its attached lathing 4, accumulates upon the mold plate or board 6, and around and-upon the lower center 3 to form the ceiling portion of the floor. The weight or stressof such concrete mass im oses a dished form on the dotirercen'ter 3 an mold plate or board 6.

Coarse concrete material is then introduced fron'rabove and is stopped by lathing 4 toaccumulate thereon, and. around and upon the upper center 2 to form the floor proper. The superior stress or load of such coarser mass-of concrete is ada ted to remove the previously existing dishe above set forth, and in turn impart a dished form to the u per center 2 and at the same t fie initially dished form of the lathing before set forth, and as illustrated in Fig. 3. In the preferred construction,

form ofthe lower center 3,

the ends of the lathing 4 adjacent to-the tubular frame members or girders 1, will be turned down, to form intermediate spaces 7 for the reception of a mass .of concrete to wholly inclose said members or girders 1, and as illustrated inFig. 3.

Having thus fully described my said inven tion what I claim as new and desire to secure by Letters Patent, is

The herein described method of forming hollow reinforced concrete floors in which the reinforce is formed by'wires wound around a-border frame of round tubing to provide upper and lower skeleton wire centers with perforated lathing secured to the upper sec tion, with a movement of the one section effecting a corresponding movement of the other section, such method involving thepreliminary introduction from above of a-i'ine concrete, the stoppage of the same by a temorary flexible mold plate attached to the ower center to effect an accumulation of the concrete around and upon said center, the

I orete upon and around the upper center, and

subsequent introduction from above of a ned at Chicago Illinois, this 2nd day of coarse concrete and the stopfimge of the same Octo er 1907-- by perforated lathing attae ed to the upper- 1 7 center to effect an accumulation of such con I GEORGL M GRAHAM Witnesses:

v draw the lower skeleton wire center'into a taut ROBERT BURNS,

and flat condition, substantially as set forth. FRANK S. R1111). 

